package main

import "sync"

type BeeMap struct {
    lock *sync.RWMutex
    bm map[interface{}]interface{}
}

func NewBeeMap() *BeeMap {
    return &BeeMap{
        lock:new(sync.RWMutex),
	bm:  make(map[interface{}]interface{}),
    }
}

func (m *BeeMap) Get(k interface{}) interface{} {
    m.lock.RLock()
    defer m.lock.RUnlock()
    if val, ok := m.bm[k]; ok {
        return val
    }
    return nil
}

func (m *BeeMap) Set(k interface{}, v interface{}) bool {
    m.lock.Lock()
    defer m.lock.Unlock()
    if val, ok := m.bm[k]; !ok {
	m.bm[k] = v 
    } else if val != v {
	m.bm[k] = v
    } else {
	return false
    }
    return true
}


func (m *BeeMap) Check(k interface{}) bool {
    m.lock.RLock()
    defer m.lock.RUnlock()
    if _, ok := m.bm[k]; !ok {
	return false
    }
    return true
}

func (m *BeeMap) Delete( k interface{}) {
    m.lock.Lock()
    defer m.lock.Unlock()
    delete(m.bm, k)
}
